I can agree with Shyvanna, Lux, and Leona....
...but I can't agree with Kayle. I literally thought she was a male until I played her for myself. You can't even identify her gender until she takes off her helmet or says something. The whole Samus Aran thing is bad design, especially considering she's not exactly supposed to be a tomboy.
The whole Samus Aran thing is great if it's not overdone. And since Kayle is the only champion who's like this...It's fine, and great.